Android MediaPlayer的封装

注意

本文封装是在android音视频指南-MediaPlayer概述上进行的2次开发。二次封装完成后,我提供了正在播放、暂停播放、重置、播放完成、媒体流装载完成、媒体流加载中、异常错误等的状态返回

业务需求

需要对音乐媒体类进行播放,如果需要播放的音乐本地缓存没有,需要先下载,然后加载音乐。如果有本地缓存的音乐,直接从本地缓存里面读取,然后加载最后播放

使用说明

1、你需要在自己的Activity或者Fragment去 implements PlaybackInfoListener 接口

MediaPlayerHolder mediaPlayerIngHolder = new MediaPlayerHolder();
mediaPlayerIngHolder.setmPlaybackInfoListener(this);//设置监听

2、如果是要加载网络音乐(我建议先下载下来),或者是本地音乐,需要调用

mediaPlayerIngHolder.loadMedia(path);//加载音乐,不是属于播放的状态
mediaPlayerIngHolder.play();//开始播放,注意:需要等到onStateChanged == PLAYSTATUS4才可以调用这个方法

3、如果不需要播放了,需要释放资源

 mediaPlayerIngHolder.release();
 mediaPlayerIngHolder = null;
接口回调说明
 void onTotalDuration(int duration);//返回音乐的总时长
 void onPositionChanged(int position);//当播放的进度
 void onStateChanged(int state);//记录当前的状态
 void onPlaybackCompleted();//播放完成回调
学习总结

1、每次调用mediaPlayerIngHolder.loadMedia方法,都需要 mMediaPlayer.reset(),这样是防止再次添加进来出现崩溃信息
2、为了避免阻塞主线程,预加载音乐需要使用mMediaPlayer.prepareAsync();预加载完成才可以使用mMediaPlayer.start();播放音乐

代码展示
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:播放回调
**/
public interface PlaybackInfoListener {
    void onTotalDuration(int duration);//总时长

    void onPositionChanged(int position);//当前时长进度

    void onStateChanged(int state);//记录当前的状态

    void onPlaybackCompleted();//播放完成回调
}

public interface PlayerAdapterListener {
    void loadMedia(String musiUrl);//加载媒体资源

    void release();//释放资源

    boolean isPlaying();//判断是否在播放

    void play();//开始播放

    void reset();//重置

    void pause();//暂停

    void medisaPreparedCompled();//完成媒体流的装载

    void seekTo(int position);//滑动到某个位置
}

public class MediaPlayerHolder implements PlayerAdapterListener{
    public static int PLAYSTATUS0=0;//正在播放
    public static int PLAYSTATUS1=1;//暂停播放
    public static int PLAYSTATUS2=2;//重置
    public static int PLAYSTATUS3=3;//播放完成
    public static int PLAYSTATUS4=4;//媒体流装载完成
    public static int PLAYSTATUS5=5;//媒体流加载中
    public static int PLAYSTATUSD1=-1;//错误

    public int PLAYBACK_POSITION_REFRESH_INTERVAL_MS = 500;
    private String TAG = MediaPlayerHolder.class.getSimpleName();
    private MediaPlayer mMediaPlayer;
    private ScheduledExecutorService mExecutor;//开启线程
    private PlaybackInfoListener mPlaybackInfoListener;
    private Runnable mSeekbarPositionUpdateTask;
    private String musiUrl;//音乐地址,可以是本地的音乐,可以是网络的音乐


    public void setmPlaybackInfoListener(PlaybackInfoListener mPlaybackInfoListener) {
        this.mPlaybackInfoListener = mPlaybackInfoListener;
    }


    /**
    * @date: 2019/6/21 0021
    * @author: gaoxiaoxiong
    * @description:初始化MediaPlayer
    **/
    private void initializeMediaPlayer(){
        if (mMediaPlayer == null) {
            mMediaPlayer = new MediaPlayer();
            //注册,播放完成后的监听
            mMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mediaPlayer) {
                    stopUpdatingCallbackWithPosition(true);
                    if (mPlaybackInfoListener != null) {
                        mPlaybackInfoListener.onStateChanged(PLAYSTATUS3);
                        mPlaybackInfoListener.onPlaybackCompleted();
                    }
                }
            });

            //监听媒体流是否装载完成
            mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    medisaPreparedCompled();
                }
            });

            /**
            * @date: 2019/6/21 0021
            * @author: gaoxiaoxiong
            * @description:监听媒体错误信息
            **/
            mMediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
                @Override
                public boolean onError(MediaPlayer mp, int what, int extra) {
                    if (mPlaybackInfoListener!=null){
                        mPlaybackInfoListener.onStateChanged(PLAYSTATUSD1);
                    }
                    Log.d(TAG, "OnError - Error code: " + what + " Extra code: " + extra);
                    switch (what) {
                        case -1004:
                            Log.d(TAG, "MEDIA_ERROR_IO");
                            break;
                        case -1007:
                            Log.d(TAG, "MEDIA_ERROR_MALFORMED");
                            break;
                        case 200:
                            Log.d(TAG, "MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK");
                            break;
                        case 100:
                            Log.d(TAG, "MEDIA_ERROR_SERVER_DIED");
                            break;
                        case -110:
                            Log.d(TAG, "MEDIA_ERROR_TIMED_OUT");
                            break;
                        case 1:
                            Log.d(TAG, "MEDIA_ERROR_UNKNOWN");
                            break;
                        case -1010:
                            Log.d(TAG, "MEDIA_ERROR_UNSUPPORTED");
                            break;
                    }
                    switch (extra) {
                        case 800:
                            Log.d(TAG, "MEDIA_INFO_BAD_INTERLEAVING");
                            break;
                        case 702:
                            Log.d(TAG, "MEDIA_INFO_BUFFERING_END");
                            break;
                        case 701:
                            Log.d(TAG, "MEDIA_INFO_METADATA_UPDATE");
                            break;
                        case 802:
                            Log.d(TAG, "MEDIA_INFO_METADATA_UPDATE");
                            break;
                        case 801:
                            Log.d(TAG, "MEDIA_INFO_NOT_SEEKABLE");
                            break;
                        case 1:
                            Log.d(TAG, "MEDIA_INFO_UNKNOWN");
                            break;
                        case 3:
                            Log.d(TAG, "MEDIA_INFO_VIDEO_RENDERING_START");
                            break;
                        case 700:
                            Log.d(TAG, "MEDIA_INFO_VIDEO_TRACK_LAGGING");
                            break;
                    }
                    return false;
                }
            });
        }
    }

    /**
    * @date: 2019/6/24 0024
    * @author: gaoxiaoxiong
    * @description: 加载媒体资源
    **/
    @Override
    public void loadMedia(String musiUrl) {
        if (StringUtils.getInstance().isEmpty(musiUrl)){
            Log.i(TAG,"地址为空");
            return;
        }

        if (mPlaybackInfoListener!=null){
            mPlaybackInfoListener.onStateChanged(PLAYSTATUS5);
        }

        this.musiUrl = musiUrl;
        initializeMediaPlayer();
        try {
            mMediaPlayer.reset();//防止再次添加进来出现崩溃信息
            mMediaPlayer.setDataSource(musiUrl);
            mMediaPlayer.prepareAsync();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
    * @date: 2019/6/24 0024
    * @author: gaoxiaoxiong
    * @description:释放媒体资源
    **/
    @Override
    public void release() {
        if (mMediaPlayer != null) {
            stopUpdatingCallbackWithPosition(false);
            mMediaPlayer.stop();
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    /**
    * @date: 2019/6/24 0024
    * @author: gaoxiaoxiong
    * @description:判断是否正在播放
    **/
    @Override
    public boolean isPlaying() {
        if (mMediaPlayer != null) {
            return mMediaPlayer.isPlaying();
        }
        return false;
    }

    /**
    * @date: 2019/6/24 0024
    * @author: gaoxiaoxiong
    * @description:播放开始
    **/
    @Override
    public void play() {
        if (mMediaPlayer != null && !mMediaPlayer.isPlaying()) {
            mMediaPlayer.start();
            if (mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onStateChanged(PLAYSTATUS0);
            }
            startUpdatingCallbackWithPosition();
        }
    }

    /**
    * @date: 2019/6/21 0021
    * @author: gaoxiaoxiong
    * @description:开启线程,获取当前播放的进度
    **/
    private void startUpdatingCallbackWithPosition() {
        if (mExecutor == null) {
            mExecutor = Executors.newSingleThreadScheduledExecutor();
        }
        if (mSeekbarPositionUpdateTask == null) {
            mSeekbarPositionUpdateTask = new Runnable() {
                @Override
                public void run() {
                    updateProgressCallbackTask();
                }
            };
        }

        mExecutor.scheduleAtFixedRate(
                mSeekbarPositionUpdateTask,
                0,
                PLAYBACK_POSITION_REFRESH_INTERVAL_MS,
                TimeUnit.MILLISECONDS
        );
    }

    @Override
    public void reset() {
        if (mMediaPlayer != null) {
            loadMedia(musiUrl);
            if (mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onStateChanged(PLAYSTATUS2);
            }
            stopUpdatingCallbackWithPosition(true);
        }
    }

    /**
    * @date: 2019/6/24 0024
    * @author: gaoxiaoxiong
    * @description:暂停
    **/
    @Override
    public void pause() {
        if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
            if (mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onStateChanged(PLAYSTATUS1);
            }
            stopUpdatingCallbackWithPosition(false);
        }
    }

    /**
    * @date: 2019/6/21 0021
    * @author: gaoxiaoxiong
    * @description:更新当前的进度
    **/
    private void updateProgressCallbackTask() {
        if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
            try {
                int currentPosition = mMediaPlayer.getCurrentPosition();
                if (mPlaybackInfoListener != null) {
                    mPlaybackInfoListener.onPositionChanged(currentPosition);
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    /**
    * @date: 2019/6/24 0024
    * @author: gaoxiaoxiong
    * @description:加载完成回调
    **/
    @Override
    public void medisaPreparedCompled() {
        int duration = mMediaPlayer.getDuration();//获取总时长
        if (mPlaybackInfoListener != null) {
            mPlaybackInfoListener.onTotalDuration(duration);
            mPlaybackInfoListener.onPositionChanged(0);
            mPlaybackInfoListener.onStateChanged(PLAYSTATUS4);
        }
    }

    /**
     * @date: 2019/6/21 0021
     * @author: gaoxiaoxiong
     * @description:滑动播放到某个位置
     **/
    @Override
    public void seekTo(int position) {
        if (mMediaPlayer != null) {
            mMediaPlayer.seekTo(position);
        }
    }


    /**
    * @date: 2019/6/21 0021
    * @author: gaoxiaoxiong
    * @description:播放完成回调监听
    **/
    private void stopUpdatingCallbackWithPosition(boolean resetUIPlaybackPosition) {
        if (mExecutor != null) {
            mExecutor.shutdownNow();
            mExecutor = null;
            mSeekbarPositionUpdateTask = null;
            if (resetUIPlaybackPosition && mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onPositionChanged(0);
            }
        }
    }
}

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